Williams, however, pushed forward again and landed three clean right hands to Tyson's temple.

The American tried to step things up at the start of the fourth, but when Williams landed 26 unanswered blows, the self-proclaimed "baddest man on the planet" crumbled against the ropes for the fifth defeat of his tempestuous career.

Tyson left the ring refusing to talk, but his manager
Shelly Finkel blamed the defeat on a twisted knee late in the first round.

"He couldn't get leverage," Finkel said. "When the guy
was leaning on him I knew it would be a bad night."